Overview.
> Broadband demand.
> Efficiency offsets.
> Spectrum demand.
> The evolving user.
> WiFi congestion.
> Spectrum from where?
> Cognitive radio.
> Whitespace; are there any opportunities?
> A wide brown land (horses for courses).
Consumer demand expected to plateau, however M2M
expected to climb resulting in overall exponential growth.
Methods of traffic abatement
> New technologies
•1995. 1 bit/Hz
•2000. 5 bits/Hz
•2005. 10 bits/Hz
•2010. 15 bits/Hz
•2020. 20 bits/Hz??
Technologies such as MIMO may
deliver up to 50 bits/Hz. That’s 500
Mbit for a 10 MHz Channel!!!!
So where is the Shannon limit????
Methods of traffic abatement
> Increased infrastructure — greater number of smaller cells.
> Not acceptable to trade spectrum for infrastructure $$ while
legacy equipment still operates.
> ACMA will consider incumbents before re-farming spectrum.
The problems begin at about 39:50 into the keynote speech at World Wide Developers Conference , when Jobs tries to
connect to the New York Times Web site from the iPhone. Jobs gives an audible sniff of disgust (40:03) when the page
doesn’t load, saying “our networks in here are always unpredictable, so… no idea what we’re going to find,” then “they
are slow today.”
40:20 “you know you can help me out if you’re on WiFi, if you’d just get off… I’d appreciate it” (laughs). Then he finally
gave up, saying “I have a problem and I’m not going to be able to show you much today.” He then punted to show
photos from the camera roll – which doesn’t require a network connection.
Congestion!!
it was the overwhelming number of portable WiFi
access points competing for airspace that caused
the problems. According to InfoWorld’s
consultation with an Apple engineer at the
event, over 500 networks were in operation at the
same time.
Do we need to allocate more spectrum??
60 GHz????
Project IEEE 802.11ad Very High Throughput in 60 GHz
Cognitive radioACMA engineers continue to look at the issues and
contribute to international debate.
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